Oliver C. Queenan

Oliver Charles "Charley" Queenan (1940-2006) was the head of the Massachusetts State Police's undercover unit. He was murdered by the Costello Mob in 2006.

Biography
Oliver Charles Queenan was born in Boston, Massachusetts in 1940, and he was raised by his mother, as his father had abandoned the famly when he was young. He entered the Massachusetts State Police and rose to the rank of captain, becoming head of the undercover unit; he also married and had a son, Patrick, who went to Notre Dame University during the 2000s. Queenan led the fight against Francis Costello's Irish Mob during this time, with Staff Sergeant Sean Dignam serving as his right-hand man. Queenan and Dignam had police academy trainee Billy Costigan expelled from the academy on trumped-up assault charges so that he could infiltrate the Costello Mob, and Costigan found out that Costello was an FBI informant, telling this to Queenan.

Death
Later, Costigan, who was stressed about his undercover work, asked to meet with Queenan on a rooftop at Washington Street, but, unbeknownst to Queenan, he was followed by the police, who had been sent to tail him by corrupt cop Colin Sullivan (who claimed that Queenan was a mole for Costello). The tailing cops became convinced of this when Costello's crew showed up, and Queenan had Costigan escape down the fire exit as he stayed behind to confront the mobsters. The mobsters asked where Queenan's "boy" was, and Queenan, feigning ignorance, told them that his "boy" (his son) was in law school. The angry mobsters went on to throw him out of a window to his death.